The New York Yankees are suddenly without baseball's all-time saves leader.

Manager Joe Girardi said Mariano Rivera tore the ACL in his right knee, an injury that could potentially end his career. Rivera injured the knee while shagging balls near the outfield wall during batting practice before the Yankees' 4-3 loss at Kansas City. He was carted off the field before an MRI determined the extent of the


The 42-year-old Rivera hinted during spring training that this could be his final year in the major leagues, but also said that he won't announce his long-term plans until after the season.

His last trip to the disabled list came in 2003, when he had a groin strain.

(Copyright 2012 by The Associated Press. All Rights Reserved.)